21765286474 has 16 divisors (see below), whose sum is σ = 33143217408. Its totient is φ = 10717625952.

The previous prime is 21765286471. The next prime is 21765286489. The reversal of 21765286474 is 47468256712.

It is not an unprimeable number, because it can be changed into a prime (21765286471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 612934 + ... + 647470.

It is an arithmetic number, because the mean of its divisors is an integer number (2071451088).

Almost surely, 2^21765286474 is an apocalyptic number.

21765286474 is a deficient number, since it is larger than the sum of its proper divisors (11377930934).

21765286474 is a wasteful number, since it uses less digits than its factorization.

21765286474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39309.

The product of its digits is 4515840, while the sum is 52.

The spelling of 21765286474 in words is "twenty-one billion, seven hundred sixty-five million, two hundred eighty-six thousand, four hundred seventy-four".